static gboolean ev_sidebar_links_support_document (EvSidebarPage *sidebar_page,
EvDocument *document);
static const gchar* ev_sidebar_links_get_label (EvSidebarPage *sidebar_page);
static gboolean ev_sidebar_links_support_document (EvSidebarPage *sidebar_page,
EvDocument *document);
static const gchar* ev_sidebar_links_get_label (EvSidebarPage *sidebar_page);